At low temperatures,the slow addition of mole | vedclass

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Question

(A) The reaction of molecular bromine $(Br_2)$ with an enyne $(CH_2=CH-CH_2-C \equiv CH)$ is regioselective. At low temperatures,the electrophilic add

Vedclass · Accepted Answer

$CH_2=CH-CH_2-CBr=CHBr$

Vedclass · Answer

(A) The reaction of molecular bromine $(Br_2)$ with an enyne $(CH_2=CH-CH_2-C \equiv CH)$ is regioselective. At low temperatures,the electrophilic addition of $Br_2$ occurs preferentially at the more nucleophilic site. In this molecule,the terminal alkyne group is less reactive towards electrophilic addition compared to the alkene group,but the addition of $Br_2$ to the triple bond is a characteristic reaction. However,under controlled conditions,the addition occurs across the triple bond to form a dibromoalkene: $CH_2=CH-CH_2-C \equiv CH + Br_2 	o CH_2=CH-CH_2-CBr=CHBr$.

At low temperatures,the slow addition of molecular bromine to $CH_2=CH-CH_2-C \equiv CH$ gives:

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